Interruptions in electrical service (i.e. power outages) may have varying impacts on retail food establishments and consequently to public health.  The attached link provides widely accepted guidelines for addressing power outages and other disruptions to retail food operations.  Please take a moment to review and implement sections applicable to your specific situation.
http://www.foodprotect.org/media/guide/Emergency%20Action%20Plan%20for%20Retail%20food%20Est.pdf